Abstract
Insulators are one of the many components responsible for the reliability of electricity supply as part of transmission and distribution lines. Failure of the insulator can cause considerable economic problems that are much greater than the insulator cost. When the failure occurs on the transmission line, a large area can be without electricity supply or other transmission lines will be overloaded. Because of the consequences of the insulator’s failure, diagnostics of the insulator plays a significant role in the reliability of the power supply. Basic diagnostic methods require experienced personnel, and inspection requires moving in the field. New diagnostic methods require online measurement if it is possible. Diagnostic by measuring the leakage current flowing on the surface of the insulator is well known. However, many other quantities can be used as a good tool for diagnostics of insulators. We present in this article results obtained on the investigated porcelain insulators that are one of the most used insulation materials for housing the insulator’s core. Leakage current, dielectric loss factor, capacity, and electric charge are used as diagnostic quantities to investigate porcelain insulators in different pollution conditions and different ambient relative humidity. Pollution and humidity are the main factors that decrease the insulator´s electric strength and reliability.
Highlights
Insulators are pieces of electrical equipment to support electrical conductors on transmission and distribution towers and to separate them electrically from equipment that must not be under voltage
According to the search of a publication focused on diagnostics of insulators, no research uses these quantities to diagnose the influence of pollution and humidity on insulators
Measurement of Capacity in the Frequency Range from 1 Hz to 200 kHz In Figure 8, we present the results of measured capacity under different pollution levels and on the clean insulator
Summary
Insulators are pieces of electrical equipment to support electrical conductors on transmission and distribution towers and to separate them electrically from equipment that must not be under voltage. N.A. Othman et al use a shunt resistor connected to the grounded end to measure leakage current on glass insulator string and results show significant changes with increasing contamination [23]. Leakage current measurement is a suitable diagnostics method to investigate the impact of pollution and humidity. According to the search of a publication focused on diagnostics of insulators, no research uses these quantities to diagnose the influence of pollution and humidity on insulators. These quantities can measure at low voltages as leakage current. Measurement of multiple quantities for pollution investigation could show more significant differences between pollution levels and humidity rate and should be more suitable for pollution investigation
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